CN202363897U - Protection circuit for preventing overshoot and surge - Google Patents
Protection circuit for preventing overshoot and surge Download PDFInfo
- Publication number
- CN202363897U CN202363897U CN 201120480633 CN201120480633U CN202363897U CN 202363897 U CN202363897 U CN 202363897U CN 201120480633 CN201120480633 CN 201120480633 CN 201120480633 U CN201120480633 U CN 201120480633U CN 202363897 U CN202363897 U CN 202363897U
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- Prior art keywords
- voltage
- comparator
- slide rheostat
- triode
- surge
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- Expired - Fee Related
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Abstract
The utility model discloses a protection circuit for preventing overshoot and surge, which mainly comprises a voltage regulator tube, a slide rheostat, a comparator and a triode. An in-phase input end of the comparator is connected with a slide contact end of the slide rheostat; pins at the two fixed ends of the slide rheostat are respectively grounded and connected with a power source; an inverse-phase input end of the comparator is grounded through the voltage regulator tube and is connected with a resistor so as to be used as a voltage input end; an output end of the comparator is connected with a base electrode of the triode; an emitting electrode of the triode is grounded; and a collector electrode is used as a voltage output end. The voltage is clamped by input voltage at a voltage regulation value through the voltage regulator tube, and is connected with one end of the comparator; the power source voltage is proportionally regulated through the slide rheostat; and the voltage value is regulated to be less than the voltage regulation value. The output is controlled through a transistor behind the comparator when the comparator works, so that the influence on the output end caused by fluctuation of the power source voltage can be effectively prevented.
Description
Technical field
The utility model relates to a kind of protective circuit, the concrete protective circuit that relates to a kind of anti-overshoot, anti-surge.
Background technology
In the technical development field of supply socket; The relevant surge (or being called unusual or surge signal) that how to prevent destroys the signal processing apparatus that is connected in this supply socket via the power supply signal line; Significant consideration when always being the designing power supply socket also is safety test is carried out in supply socket before listing an emphasis monitoring project.
The general more complicated of protective circuit of anti-overshoot of the prior art, anti-surge has directly caused the increase of production cost.
The utility model content
For overcoming deficiency of the prior art, the purpose of the utility model be to provide a kind of simple in structure, can effectively prevent because of the anti-overshoot that mains fluctuations impact output, the protective circuit of anti-surge.
For realizing above-mentioned technical purpose, reach above-mentioned technique effect, the utility model has adopted following technical scheme:
The protective circuit of a kind of anti-overshoot, anti-surge; Mainly form by voltage-stabiliser tube, slide rheostat, comparator, triode etc.; The in-phase input end of said comparator connects the sliding contact end of said slide rheostat, two stiff end pins of said slide rheostat respectively ground connection with connect power supply, the inverting input of said comparator is through said voltage-stabiliser tube ground connection; And connect a resistance as voltage input end; The output of said comparator connects the base stage of said triode, the grounded emitter of said triode, and collector electrode is as voltage output end.
The operation principle of the utility model is following:
Input voltage is connected voltage clamp through voltage-stabiliser tube on a voltage stabilizing value and with an end of comparator; Supply voltage is regulated through the ratio of slide rheostat; Magnitude of voltage is adjusted under the voltage stabilizing value, this moment comparator works, and the output of the transistor controls through thereafter.
Compared with prior art, the utlity model has following advantage:
The used components and parts of the protective circuit of the anti-overshoot of the utility model, anti-surge are fewer, annexation is simple, and can effectively prevent because of mains fluctuations output to be impacted.
Above-mentioned explanation only is the general introduction of the utility model technical scheme, in order more to know the technological means of understanding the utility model, and can implement according to the content of specification, below with the preferred embodiment of the utility model and conjunction with figs. specify as after.
Description of drawings
Accompanying drawing described herein is used to provide the further understanding to the utility model, constitutes the application's a part, and illustrative examples of the utility model and explanation thereof are used to explain the utility model, do not constitute the improper qualification to the utility model.In the accompanying drawings:
Fig. 1 is the framework sketch map of the utility model.
Fig. 2 is the circuit theory diagrams of the utility model.
Embodiment
Below with reference to accompanying drawing and combine embodiment, specify the utility model.
Referring to Fig. 1, shown in Figure 2; The protective circuit of a kind of anti-overshoot, anti-surge mainly is made up of voltage-stabiliser tube U1, slide rheostat R1, comparator U2, triode Q1, and the in-phase input end of said comparator U2 connects the sliding contact end of said slide rheostat R1; The two stiff end pins of said slide rheostat R1 respectively ground connection with connect power supply; The inverting input of said comparator U2 passes through said voltage-stabiliser tube U1 ground connection, and connects a resistance R 2 as voltage input end, and the output of said comparator U2 connects the base stage of said triode Q1; The grounded emitter of said triode Q1, collector electrode is as voltage output end.
The preferred embodiment that the above is merely the utility model is not limited to the utility model, and for a person skilled in the art, the utility model can have various changes and variation.All within the spirit and principle of the utility model, any modification of being done, be equal to replacement, improvement etc., all should be included within the protection range of the utility model.
Claims (1)
1. the protective circuit of an anti-overshoot, anti-surge; Mainly form by voltage-stabiliser tube (U1), slide rheostat (R1), comparator (U2), triode (Q1); It is characterized in that: the in-phase input end of said comparator (U2) connects the sliding contact end of said slide rheostat (R1); Two stiff end pins of said slide rheostat (R1) respectively ground connection with connect power supply; The inverting input of said comparator (U2) passes through said voltage-stabiliser tube (U1) ground connection, and connects a resistance (R2) as voltage input end, and the output of said comparator (U2) connects the base stage of said triode (Q1); The grounded emitter of said triode (Q1), collector electrode is as voltage output end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120480633 CN202363897U (en) | 2011-11-28 | 2011-11-28 | Protection circuit for preventing overshoot and surge |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201120480633 CN202363897U (en) | 2011-11-28 | 2011-11-28 | Protection circuit for preventing overshoot and surge |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202363897U true CN202363897U (en) | 2012-08-01 |
Family
ID=46575053
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201120480633 Expired - Fee Related CN202363897U (en) | 2011-11-28 | 2011-11-28 | Protection circuit for preventing overshoot and surge |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202363897U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103248036A (en) * | 2013-05-15 | 2013-08-14 | 成都市宏山科技有限公司 | Turn-on anti-surge protector for radio interface |
| CN103346546A (en) * | 2013-06-28 | 2013-10-09 | 成都汉康信息产业有限公司 | Lightning protection circuit used for remote measurement terminal |
-
2011
- 2011-11-28 CN CN 201120480633 patent/CN202363897U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103248036A (en) * | 2013-05-15 | 2013-08-14 | 成都市宏山科技有限公司 | Turn-on anti-surge protector for radio interface |
| CN103346546A (en) * | 2013-06-28 | 2013-10-09 | 成都汉康信息产业有限公司 | Lightning protection circuit used for remote measurement terminal |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20120801 Termination date: 20181128 |